I went with a Power Expander Pro from Smart-Fly on my 50cc Pitts Python, the $149.00 price tag was way worth it... I was able to plug in all 4 ail. without any "Y's" as well as my Elv and didn't have to do any mixing, it made set up as easy as a 4ch trainer..Italso is set up for two batteries and regulates the power to the RX to 5 volts but allows full power to the servos and I only need the one pin style failsafe switch..

Jimbo